Preheat the oven to 450 degrees F (230 degrees C). Line a baking sheet with parchment paper or use a nonstick baking sheet.
Whisk flour, sugar, baking powder, cream of tartar, and salt together in a large bowl. Cut in 3/4 cup cold butter with a pastry cutter until butter is pea sized. Add milk, 2 tablespoons maple syrup, and egg; mix until combined. Do not overmix. Dough will be sticky with visible pieces of butter.
Turn dough out onto a generously floured surface; sprinkle bacon pieces on top. Gently knead dough to incorporate bacon, 10 to 15 times, sprinkling with additional flour if dough is super sticky.
Pat dough out to a 3/4 to 1 inch thickness; cut with a biscuit cutter or glass. Transfer biscuits to the prepared baking sheet.
Bake in the preheated oven until golden brown on top, 10 to 15 minutes. Brush tops with 2 tablespoons melted butter and remaining 2 tablespoons maple syrup for extra depth.
Maple-Bacon Biscuits · Dinner Match Lab | Dinner Match Lab